1RO8

Structural analysis of the sialyltransferase CstII from Campylobacter jejuni in complex with a substrate analogue, cytidine-5'-monophosphate


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.05 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.258 

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Ligand Structure Quality Assessment 


This is version 1.4 of the entry. See complete history


Literature

Structural analysis of the sialyltransferase CstII from Campylobacter jejuni in complex with a substrate analog.

Chiu, C.P.Watts, A.G.Lairson, L.L.Gilbert, M.Lim, D.Wakarchuk, W.W.Withers, S.G.Strynadka, N.C.

(2004) Nat Struct Mol Biol 11: 163-170

  • DOI: https://doi.org/10.1038/nsmb720
  • Primary Citation of Related Structures:  
    1RO7, 1RO8

  • PubMed Abstract: 

    Sialic acid terminates oligosaccharide chains on mammalian and microbial cell surfaces, playing critical roles in recognition and adherence. The enzymes that transfer the sialic acid moiety from cytidine-5'-monophospho-N-acetyl-neuraminic acid (CMP-NeuAc) to the terminal positions of these key glycoconjugates are known as sialyltransferases. Despite their important biological roles, little is understood about the mechanism or molecular structure of these membrane-associated enzymes. We report the first structure of a sialyltransferase, that of CstII from Campylobacter jejuni, a highly prevalent foodborne pathogen. Our structural, mutagenesis and kinetic data provide support for a novel mode of substrate binding and glycosyl transfer mechanism, including essential roles of a histidine (general base) and two tyrosine residues (coordination of the phosphate leaving group). This work provides a framework for understanding the activity of several sialyltransferases, from bacterial to human, and for the structure-based design of specific inhibitors.


  • Organizational Affiliation

    Department of Biochemistry and Molecular Biology, University of British Columbia, 2146 Health Sciences Mall, Vancouver, British Columbia V6T 1Z3, Canada.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
alpha-2,3/8-sialyltransferase
A, B
262Campylobacter jejuniMutation(s): 5 
Gene Names: cst
EC: 2.4.99
UniProt
Find proteins for Q9LAK3 (Campylobacter jejuni)
Explore Q9LAK3 
Go to UniProtKB:  Q9LAK3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9LAK3
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
MSE
Query on MSE
A, B
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.05 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.258 
  • Space Group: P 4
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 115.434α = 90
b = 115.434β = 90
c = 41.059γ = 90
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
CNSphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-02-03
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2021-10-27
    Changes: Database references, Derived calculations
  • Version 1.4: 2024-10-16
    Changes: Data collection, Structure summary